[s-cars] G50 is GL-5 or GL-4 and Amsoil in tranny

Kirby Smith kirby.a.smith at verizon.net
Sat Jul 19 15:28:03 EDT 2003

GL-5, when very hot, attacks brass, the material generally used in
synchro rings.  Use a gL-4 for the tranny/front diff.


Vincent Frégeac wrote:
> Anyone knows if the the Audi G50 for our tranny is a GL-5 or a GL-4? My
> mech filled the tranny and the diff with 75W90 GL-5. It should be OK for
> the diff as the Redline recommended oil for the diff is also a 75W90
> GL-5. But I'm scared for the tranny as the GL-5 was said to make the
> synchro slip on the 90Q20V which could lead to serious damage to the
> gear. Is it the same with the 01E? Should I change it asap? The gear are
> still shifting OK, at least as well as with the 125Kmiles old oil but I
> would have expected smoother shifting with the new oil.
> BTW, have anyone tried the Amsoil 75W90 GL-4 MIL-L 2105 in the tranny?
> This oil is readily available when I have to wait may be a week for
> Redline MTL.
> Vincent
> '96 //S6
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